Andy sat backwards on the old wooden chair in the middle of Mia's bedroom, her legs spread wide. She was naked except for the black leather restraints fixing her ankles to the chair legs on either side, and the cuffs locking her wrists in front of her, around the back of the chair. Her teardrop breasts pressed against the wooden slats of the chair back. Her ass and shaved pussy hanging helplessly off the edge. She hated to admit it, but she was a slut for light bondage. It did something to her and her slit was drooling down on the hardwood floor below.
She watched in anticipation as Mia went back to the wooden box on her bed, sifting through her collection of toys and devices. Mia turned back to Andy with a wicked smile, and held up a pink ball gag. "I need to keep you quiet. I can hear my mom in the kitchen." She said calmly, moving behind her bound, and soon to be gagged half-sister. Mia pulled Andy's hair back gently, and fit the ball gag in her mouth, careful not to cause Andy too much discomfort. She tightened the leather strap and that was it. This was not Mia's first time, and she seemed to relish every moment.
She took a step back and admired her hostage. Andy wriggled against her restraints, but it was no use. Mia was in full control and she was taking her time. The girls could hear Samantha unloading the dishwasher only a few feet from Mia's bedroom door. Mia walked up behind her sister and groped her perfect ass, squeezing and shaking it gently. "That's a good pet. You're all mine now, do you understand me?"
Andy nodded, "Mmhmph...." Drool began spilling out the sides of the gag and dripped down her chin. Mia picked up a small butt plug from her collection.
She reached around and slid her fingers up Andy's tummy and chest, all the way to her sticky chin. "This will work nicely." She said with sly smirk, before wrapping Andy's drool around the steal plug. When Andy felt the cold metal, slick with her own saliva against her asshole she flinched and her pussy oozed out even more honey. "It's alright, pet. I'm not going to hurt you. I just need you to feel my love." Mia whispered, and began to push the plug in, nice and slow.
Andy relaxed her muscles as much as possible, pushing back against cold steel invading her body. It had been over a week since her Dad fucked her ass and brought her to heel. Now his daughter was claiming her tightest hole for herself. Mia teased the plug in and out slowly, helping Andy stretch to accommodate it. And then, like that, Mia watched as Andy's little ring swallowed up the oblong shape. All that remained visible was an emerald jewel. Andy let out a low groan and tried to grind her cunt against the chair, but Mia made sure she wouldn't be able to find any relief for her swollen clit on her own. She was at her sister's mercy, and the thought made Mia shiver.
Mia grabbed a pink vibrator and switched it on, sitting crosslegged behind Andy's peach shaped ass. She pressed the vibrator gently against Andy's clit and drank in the sight of her helpless big sister trembling from the stimulation. "Quiet as a mouse, Andy..." Mia teased. She put her tongue flat against Andy's leaking slit and dragged it up slowly, from her clit up to the emerald jewel, eating her big sister from behind.
Andy shuddered hard and bucked against the straps and cuffs. The orgasm racked her bound body as Mia twisted the screws of her beautiful agony. Mia forced her tongue deep inside and Andy could feel her searching for her secret place where her honey was made. Mia moaned when she found it, tasting her sweet nectar right at the source. Andy came again. "Good pet." Mia whispered against her glistening cunt. It was all Andy could do to keep from babbling nonsense through the plastic ball in her mouth, as she was racked by orgasm after orgasm for the next 40 minutes.
When Mia was finished, Andy was slumped over the back of the chair, her jet black hair shrouding her face as she trembled and shook from the overstimulation. Mia wiped her chin and got back to her feet. Slowly and methodically, she freed her sister from her restraints. Andy didn't even notice. Her mind had been erased and it would take some time for her to reconstitute her thoughts.
Mia released the strap for the ball gag and tossed it on the towel laid out on the bed. She tugged Andy up by her hair and traded positions with her. Now Andy was on her knees, bowing before her young master. Mia was seated in the chair, feet up on the seat with her legs open. She reached forward and pulled Andy's mouth to her own shaved cunt. "Eat." She commanded, and Andy obeyed.
Andy was still in daze, so Mia rocked her small hips against her sister's mouth. It was her turn to cum and she wouldn't be denied. Wet slurping sounds danced off the walls of the room as Andy started to regain her senses. She leaned forward and grabbed her little sister just behind the knees, lifting her feet up and angling her back against the back of the chair. "Oh fuck..." Mia moaned a little too loudly, her mother chopping carrots for dinner only feet away.
Andy had a better angle on her sister's slit now. She sucked and licked and slurped Mia's bald pussy with a ferocity Mia had learned to crave over the past week. She clenched her tummy and forced the pressure down into her lower body. Mia's eyes found Andy's for a moment before they rolled back in her head. She squirted against Andy's hungry mouth and lapping tongue.
When it was over, the girls took a moment to collect themselves, crumpled into a tangled mess at the foot of the chair. They caressed one another, tender and sweet. It took a few minutes, but eventually they caught their breath and composed themselves. It was almost time for dinner. As Mia started to get dressed, Andy had her back to her sister, looking at her over her shoulder. She looked down at the plug and back at Mia. "Leave it in." Mia said flatly.
It was 6:10pm when Mia and Andy came out from Mia's room holding hands. "Mia. I thought that was you," Samantha's face didn't surrender any clues to what she may have heard. "Who's your friend?" Samantha turned and smiled warmly at Andy. Andy was captured by Samantha's eyes, the same emerald green as Mia's. The same color as the plug in her butt. Andy flexed around the toy and tried to keep her eyes from fluttering.
"Mom, this is Mia. She's in my Chemistry class," She lied. She looked at Andy and smiled. "We just started dating."
"She's very pretty," Samantha's compliment made Andy's knees weak. "Mia, can you take out the trash? It's time for dinner and your Dad will be home soon."
She picked up the bag and headed out the side door with Andy following close behind. It was garbage night and the cans were already on the street. Mia made her way down the driveway and tossed the bag in the bin. She looked up and noticed a man leaning against a post on the porch across the street. He was in his early 30's. Tall, with an athletic build. His hair was buzzed short with a scruffy 5 o'clock shadow. He was beautiful, and he was staring at Andy.
